Improvement jn machines tor the manufacture of thick-paper



D. SflIHH/[Gl-IOUR. Machine for the Manufacture of Thick Paper.

Patented Oct. 30, 1877.

W172 cuss 0s.

m m Z 0 a w w m I w w w m and saturated with such aprons, the water in the pulp is expressed lL-HVID SOlFYMGEOUh, OF BOSTON, ASSIGNOR FGXIBOROUGH, MASSA GHUSEITS.

To YVILLI-AM'T; coon, or

IMPROVEMENT lN MACiilNESlOR THE MANUFACTURE OF THICK-PAPER.

Fpecilication fl)l 'll.lllg part of Letters Patent No. 396,5d2, dated October 30, 1877; application filed August 3, 1877. I p

.fio all whom it may concern:

(Be it known. that I, DAVID SGRY WGEOUR, of Boston, Suffolk county, Massaclnisetts, have invented certain I1n provements' in Fourdrinier Paperdllaehines, of which the following is a specification:

This invention relates to means for providing; a more eifectual method of extracting water from paper-pulp in Fourdrinierpapermachines than. the suction-boxes now universally employed to effect such object; and the invention, which maybe employed as a substitute for'or in combination with such suetion-boxes, consists in an endless reticulated or itoraininous apron disposed over the ordir nary Wire-cloth apron of the machine, and traveling in the same direction, and prei era bly at the same rate of speed, as the latter, the space which intervenes between the two aprons being adjusted to the desired thick-.

ness of the sheet of pulp, and being of such depth that as the webot' pulp, after traveling from between the deckle-straps, so called, water, passes between by the pressure, and escapes through the interstices of the two aprons.

The purpose of my invention is-to produce a homogeneous sheetof pulp for the manufacture t boot and shoe stifi'enings, and other hollm oriiregrular articles, which shall be very much thicker than has heretofore been produced in paperunaking machines; and I have found, in. extended experiments 011 a large scale, that the mechanical pressure between the two reeticulated aprons above alludcd to has the e'ftect of cx n'essing water from a much thicker body or sheet'of pulp than is possible to produce by the suction principle.

The d H-WlllgS accompanying this specification represent, in Figure 1, a plan, and in Fig. 2 a vertical and hmgitudinal section, of a portion of a l ourdrinicr aper-1naking machine with my improvements added.

.gn the said drawings,'A A. represent upri it housings, composed of top horizontal rai YB li, end standards C (J, and crossbars l) D, eaeh'housing being ibrmcd with two hangers, E l), to support a pair of horizontal parallel stretching-rollers, FF, whose journals revolve in boxes in said hangers, such boxes being adjustable, in order that the slack of the endless woven-wire apron proper of the paper-machine which is shown at G may be taken up and the apron kept taut. At each end of the housings A A are disposed horizontal parallel guide or support rollers H H, whose journals revolve in bearings or boxes aiiixed to the rails B, while in termediate between these rollers, and with their upper surfaces in the same horizontal plane as those of the rollers H H, are a series of idlerolls, the upper part 'of the apron The said apron G travels about the rollers 'F F, H H, and I I, 8th., as shown nrrtgl a'efisa-rsmwrngs and is to rc n'esent a portion of the ordinary woven-wire apron universally employed in paper-machines to receive the wet pulp from the screen, and guide the web until the water is practically extracted from it, the auxiliary or additional apron, which constitutes the subject of my present improvement, being situated, preferably, immediately after the deckle-straps or the dandy-roll which may be employed thereat.

My auxiliary apron is shown, at Kin the accompanying drawings, as composed of woven wire-cloth, like the lower apron G, and travels about three support-rolls, a, a, and b, the two formerbeing disposed horizontally, and in paralellisn'i over and slightly above the lower apron G, and with their journals revolving in boxes 0 c, afiixed adjustably to the top of the rails B, while the third roller, b, is likewise horizontal and parallel to the others, and is disposed .iwerthein, and hasits journals supported in boxes (I (I, applied adjustably to standards 0 c, erected upon the top of the rails B, the manner of applying the boxes of the rollers a, a, and b to the housings of the-Inachine enabling the apron K to be kept in a taut condition.

A heavy idle-roll, f, may be disposed over and resting upon the top of the lower portion of the apron K and guided in upright bearings such roller serving, in addition to the tension of such apron to keep the latter down upon the web of pulp which passes between I I, which serve to support is to manufacture ,various rolls would be eel the two apmns, and two or more of'snch rolls me be emploged, if found desirable:

he adjiista le manner of applying the boxes otthe various rollers which support" and'gnide the two reticulatedaprons enables the space intervening between such aprons to be varied as occasion requiremin-order to accommodate webs ofpnlp which may vary in thickness, or to change the degree oi pressure exerted upon suchpulpt- I ;As the main purpose of mypresent machine pulp of uniform thicknessa'the positions of the to take up the slack of the aprons.

. Heretofore, in the manufacture of such'ar' ticles which I have produced in large quantities, have found it impossible, with any paper-machine in use,to rodncee single sheet pulp of the desired t icl'n'iess, but have been compelled to unite several sheets.

As'before stated, I am enabled by the employment of the apron, K, to produce a much thicker homogeneous web or sheet of pulp than has been possible prior to my invention, and I consider my invention to consist in the employment, in combination with a Fonrdrinier or other analogous paper-making machine,

.' of an auxiliary or additional reticulated or foreminoiis a run, substantially as stated.

The exten ed snrihee which the apron K 4 presents to the web of ul preve' ts the crushing or displacement of the latter, which would l g qiiantities ofi shoe stifi'enings, or other articles which require it our changed, except occur were rollers merely employed to obtain a preeoure end such apron new in employed in connection with the 'iii'iliiliii'fv suctionboxes, or tix-ke the place of the latter, as shown:

in theacwmpanying drawings.

A limit to the functions or powers of suction-' boxes consists in the fact that the pulp in the lower part of the web 'which passes over them elogaor obstructs the escape of water from the upper part, and the suction is not of sufli cient ower to overcome it.

By he employmentoftwo reticulated aprons between which the web passes, and time al fouling/an escape for the water n 11 both sides of the web, as well as exer ng great pressure upon such web, I am enabled to thoroughly extract the water from all the pulp which will flow upon the apron proper of a machine.

The combination, with flne dless wife-cloth shakelapron of it .Foiirdriiziw pa rmaehilie, of an auxiliary reticulated apron ispesed over the first, and operating with it in such infillner that the web of pulp phi-lees between the two, and is subjected to preeenre, which expresses the water and pel'lllliii. it to esca e both sides, subs antially as: will for ti this poses stated.

DAV ll) B'UHYMHEU UR.

Witnesses:

- l3. QU'ETIS,

W. E. BOARDllM-N. 

